Table II.

Means and standard deviations of key variables and primary outcomes.

Variable (scale range)	Mean (SD)	Range
Perceived personal control (1–7) (General perceptions of control over child undiagnosed condition)	2.96 (1.6)	1 – 7
Perceived disease severity (1–7) (General perceptions of disease severity)	5.23 (1.3)	2 – 7
Life Orientation Test – Revised (0 – 24) (optimism)	12.8 (4.7)	0 – 24
Parents' Perception of Uncertainty in Illness Scale (31 – 155)	107.8 (15.4)	62 – 152
Ambiguity subscale (13 – 65)	45.8 (8.1)	20 – 65
Lack of Clarity subscale (9 – 45)	29.6 (6.0)	15 – 45
Lack of information subscale (5 – 25)	18.5 (3.2)	8 – 25
Unpredictability subscale (4 – 20)	14.0 (2.9)	7 – 20

SD, standard deviation